chzel wrote: ↑I believe a logic analyzer would be ideal. Something like
this, after you check the levels and scale accordingly of course!
Right. My coworker liked the fact that the aforementioned Gabotronics "Xminilab Portable" offering could also function as an 8 channel logic analyzer and has a little screen. So it sounds like I have one of those in my future.
For really old stuff, I can't always be sure that it follows 5V TTL logic levels so I want something that can also function as an analog scope. Case in point, the Televideo keyboard I have uses +12V power. The scope I mentioned has -14V to +20V levels. Sure I can build a resistor divider as you propose.
The same coworker also recommends Saleae logic analyzers. The Logic 8, in particular, is the one I've seen. I've borrowed it and it's really neat - comes in a little case with tiny little clip cables and everything.
https://www.saleae.com/
We're Linux people and my usual laptop is an OSX machine so cross platform support is critical for us.
From a quick glance the IkaLogic Scanalogic-2 looks a lot like the Saleae offering. But sadly I only see a "ScanaStudio Logic Analyzer software" download for Windows. That's a dealbreaker for me. Even with Wine and VMs I could get it to work but I want this sort of stuff to run natively!